Waterproof 7 mm Engineered Bamboo Flooring. Bamboo Waterproof flooring is sustainable, stylish and durable with a Janka rating of 3,000 for extreme hardness. The prefinished flooring features 7 layers of protective coating, including 2-layers of Aluminum Oxide Finish providing protection from every day wear. This product has achieved GREENGUARD Indoor Air Quality Certification and has been tested for more than 10,000 volatile organic compounds, including formaldehyde, to meet these standards. The glueless installation is easy and economical; above grade, on grade and below grade. It’s the perfect choice for residential use.